Senate Judiciary Chairman Sen. Chuck Grassley sent a letter to the FBI and White House on Tuesday expressing "significant concerns" regarding the security clearance process and who exactly has access to confidential information.

Co-signed by Democratic Sen. Richard Blumenthal, Grassley sent the letter to White House general counsel Don McGahn and FBI Director Christopher Wray looking for answers to six questions in the wake of the Rob Porter scandal.

"Recent reports reveal that officials at the highest levels of government may be operating with only interim security clearances," Grassley and Blumenthal wrote. "If true, this raises significant concerns that ineligible individuals, who hold positions of public trust, may have access to sensitive or classified information.

"It is therefore important to understand, holistically, how the clearance process works across branches of government, and whether and to what extent the recent reporting on interim clearances details a common problem or one unique to this administration," the senators wrote.

Trump said he would leave it up to chief of staff John Kelly to sort out just what Kushner would have access to, but the Grassley-Blumenthal letter raises the stakes on just who can see what with interim security clearance.

"Are individuals at the White House who work with an interim security clearance barred from handling any matters or information that would otherwise be permissible if the individual had a full security clearance? Are individuals with interim security clearances granted access to the president's Daily Brief?" asked Grassley and Blumenthal.

Senate Judiciary Chairman Sen. Chuck Grassley sent a letter to the FBI and White House on Tuesday expressing "significant concerns" regarding the security clearance process and who exactly has access to confidential information.